Do not fold, staple or 3D print

From
Roger Miles

You report the use of 3D printing to make extra bits for old objects (14 November, p 21).

I await with bated breath the first occasion when a repair or improvement made with a 3D printed component results in a failure or accident because the newly empowered “engineer” did not appreciate the design parameters of the device they were modifying.

Who will be first to spot any small print specifically disclaiming against 3D repairs or alterations?St Albans, Hertfordshire, UK